/Engine/Plugins/Developer/Concert/ConcertSync/ConcertSyncCore/Source/ConcertSyncCore/Public/ConcertSyncSessionDatabase.h
Iterates the given range, calls UpdateCallback on each element, and commits the update.
bool SetActivities ( const [TSet](API\Runtime\Core\Containers\TSet)< int64 > & ActivityIds, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< void([FConcertSyncActivity](API\Plugins\ConcertSyncCore\FConcertSyncActivity) &)> UpdateCallback )